Adjustable shotgun choke control



May 23, 1961 c. J. HAVLIN ADJUSTABLE SHOTGUN CHOKE CONTROL 2Sheets-Sheet 1 Filed Nov. 5, 1959 C1. A RE/VCE HqvL IN INVENTORATTORNEYS.

y 1961 c. J. HAVLlN 2,984,926

ADJUSTABLE SHOTGUN CHOKE CONTROL Filed Nov. 5, 1959 2 Sheets-Sheet 2CLARENCE J H VL/N INVENTOR ATTORNEYS.

2,984,926 Patented May 23, 1961 ice ADJUSTABLE SHOTGUN CHOKE CONTROLClarence J. Havlin, 2621 W. Woodlawn Ave., San Antonio, Tex.

Filed Nov. 5, 1959, Ser. No. 851,166

2 Claims. (Cl. 42-79) This invention relates to chokes for shotguns andmore particularly to that type of a choke that can be adjusted rapidlyfor each shot.

An important object of this invention is the provision of a choke forsemi-automatic shotguns having a nonrecoil barrel, the choke beinginstantly and positively adjusted by means of a lever located just abovethe trigger of the gun, in easy access to the operator.

Another object of this invention is the provision of a choke that can beattached to a shotgun without altering its muzzle.

Still another object of this invention is the provision of a choke thathas a minimum number of parts and requires little or no skill toassemble to a shotgun.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention consists of certain novel details ofconstruction and combinations of parts hereinafter more fully describedand pointed out in the claims, it being understood that changes may bemade in the construction and arrangement of parts without departing fromthe spirit of the invention as claimed.

Referring to the drawings:

Figure 1 is a side view of a shotgun showing the choke attached.

Fig. 2 is a top plan view of Fig. 1.

Fig. 3 is an enlarged top plan view of the muzzle of the gun, showingthe choke in detail.

Fig. 4 is a sectional view taken substantially along the line 4-4 ofFig. 3 as viewed in the direction indicated by the arrows.

Fig. 5 is a sectional view taken substantially along the line 55 of Fig.l as viewed in the direction indicated by the arrows.

Fig. 6 is a sectional view taken substantially along the line 6-6 ofFig. 4 as viewed in the direction indicated by the arrows.

Fig. 7 is a sectional view taken substantially along the line 77 of Fig.3 as viewed in the direction indicated by the arrows.

Fig. 8 is a sectional view taken substantially along the line 8-8 ofFig. 2 as viewed in the direction indicated by the arrows.

Fig. 9 is a sectional view taken substantially along the line 99 of Fig.2 as viewed in the direction indicated by the arrows.

Similar reference characters refer to similar parts throughout theseveral views of the drawings.

Having reference now to the drawings in detail, and in particular toFigs. 2 and 3, there is generally indicated by the reference character10 a shotgun having a barrel 11 to the muzzle 12 of which is secured achoke mechanism 13 by means of a screw 14. The stated choke mechanism 13embodies a tubular member 15 having a slot 16, the depth of which isapproximately two thirds its length. A pin 17 is secured on each side ofand at the top of the slot 16 and near the closed end thereof,

as best shown in Fig. 3 of the drawings, for the reception of theforwarclportion of a triangular-shaped cam 18 to the large end of whichis secured one end of a rod 19 that traverses the full length of thebarrel 11 of shotgun 10. The stated rod 19 is encased throughout most ofits length in a guide member 20 that is secured to the top of theshotgun barrel 11 by any desired means. The aforesaid guide member 20may be of the tubular type, or may embody a plurality of upright guides21 having a continuous top member 22 as shown in Figs. 1 and 5 of thedrawings.

A lever 23 is secured to the top of the shotgun 10 by means of ashoulder screw 24 which is the pivoting point of the lever whichcontains an elongated opening 26 through which passes a pin 25 which issecured in the rear end of rod 19, as clearly shown in Fig. 9 of thedrawings.

Looking at Fig. 4, it will be seen that the tubular member 15 containsthe bore 27 that has a shoulder 28 in that end of the choke that isfitted over the muzzle of the gun, and is approximately the samediameter as the outside diameter of the barrel beyond the muzzle, thebore having a gradual contraction area terminating in a circular radiusto a minimum choke at 29, and then increasing in a circular radius toits original diameter as noted by the reference character 30, on eachside of the point of minimum choke.

A sight 31 is fixed to the front end of the tubular member 15, whileguides 32 are fixed to the muzzle end of the stated tubular member, andon each side of the aforesaid rod 19, thus completing the constructionof this invention.

The operation of this choke is obvious from an examination of Figs. 1, 2and 3 of the drawings, wherein it can be seen that by moving the handle33 of the lever 23 located just'above the trigger 34 of the shotgun, therod 19 will obviously move forwardly or backwardly, thus opening orclosing the tubular member 15 of the choke mechanism 13 by reason of thewedge-shaped cam 18 acting on pins 17.

From the foregoing it will not be seen that there is herein provided anadjustable choke for shotguns which accomplishes all of the objects ofthis invention, and others, including many advantages of great practicalutility and commercial importance.

As many embodiments may be made of this inventive concept, and as manymodifications may be made in the embodiment hereinbefore shown anddescribed, it will be understood that all matter herein is to beinterpreted merely as illustrative and not in a limiting sense.

What is claimed is:

l. A shotgun choke comprising a tubular body adapted for positioningover the muzzle end of a shotgun barrel, an annular internal shoulderextending inwardly from the surface of said body, said annular shoulderbeing spaced from one end of said tubular body providing a stopcontacting the end of the barrel on which the choke is positioned forcentering said choke, means for securing said body on said shotgunbarrel against accidental displacement, said tubular body having a slotextending inwardly from the opposite end thereof, said slot terminatingshort of said annular shoulder providing split choke sections, spacedpins extending from the outer surface of said body and disposed onopposite sides of said slot, a triangular cam movable between said pinsadapted to spread said split choke sections, spreading the choke ofReferences Cited in the file of this patent UNITED STATES PATENTS2,490,829 Noll Dec. 13, 1949 2,662,326 Powell Dec. 15, 1953 2,765,564-Schroeder Oct. 9, 1956 2,807,903 Wheeler Oct. 1, 1957

